Stages of welding can be seen on panel 2 as follows:
To avoid heat distortion the edges are carefully welded in alternate short sections of 2-3 inches, the alterante sections being allowed to cool before filling in. This shows on the vertical edges which have not yet been gound flush.
Along the bottom edge the weld has now been ground flush to give a crisp edge.
Dave did worry that these panels might suffer from heat distortion but in the end managed to get them all in absolutely flat.
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